12AX7A preamp tubes - ribbed vs smooth plate


So I'm gonna buy some preamp tubes for an amplifier and now I see I have to choose between ribbed and smooth plate (nos telefunken Germany from the 60s).

Anyone have thoughts on which way I should go when I have speakers that are detailed.  

 

emergingsoul

I have tried Smooth plate and Ribbed plate Tele's in my CAT preamp, much prefer the Smooth plates. The Ribbed plates are a little brighter and tend to be less resolving. Perhaps in a different position, or component, this might not be the case??

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"Glenn Croft (RIP) told me he used buy Telefunken ECC803S for £5.95 a pop. Now they sell for $1500+"

You can spend a lot less than $1500 each for a pair of Telefunken long/smooth plate 12AX7s tested and strong.  In fact, you can even get a pair for $125 right here on Audiogon if you look for them.